Full screen not working in Episerver?

Why is full screen not working in Episerver?

When publishing video in your Content Management System by copy and pasting embed codes and not inserting from plugins, the CMS (in this case Episerver) may modify the embed code after it is saved on your page.

Cause

In many Episerver configurations the editor where you enter html embed codes (TinyMCE) will remove the "allowfullscreen" attribute from embed codes, blocking the full screen functionality of the player.

Solution

If you are experiencing problem with full screen on videos in Episerver, please contact your systems administrator regarding either installing the free Screen9 Plugin for Episerver or allowing the "allowfullscreen" attribute for iframe embed codes in the TinyMCE editor on your Episerver.